作者:Anna G. Lyapunova、Natalia A. Danilkina、Alexander F. Khlebnikov、Beate Köberle、Stefan Bräse、Irina A. Balova
DOI:10.1002/ejoc.201600767
日期:2016.10
macrocyclization has been used for the first time for the synthesis of 10- and 11-membered oxaenediynes fused to a benzothiophene. The acyclic starting materials were easily synthesized by electrophilic cyclization of o-(buta-1,3-diynyl)thioanisoles followed by a Sonogashira coupling of the resulting 2-ethynyl-3-iodobenzothiophenes with functionalized alkynes. A high reactivity of the 10-membered oxacycles
Nicholas 型大环化首次用于合成与苯并噻吩稠合的 10 和 11 元氧杂二炔。通过 o-(buta-1,3-diynyl) thioanisoles 的亲电环化,然后将得到的 2-ethynyl-3-iodobenzothiophenes 与官能化的炔烃进行 Sonogashira 偶联,可以很容易地合成无环原料。通过 DFT 计算预测并通过差示扫描量热法证实了 Bergman 环化中 10 元氧杂环的高反应性。还发现了烯二炔诱导单链 PM2 DNA 断裂的能力。